From the Research
The average size of a testis (testicle) is approximately 4 to 5 centimeters (1.5 to 2 inches) in length and about 2 to 3 centimeters (0.8 to 1.2 inches) in width, with a volume of around 15 to 25 cubic centimeters, as supported by the most recent and highest quality study 1.
Testicular Size Variability
The size of testicles can vary considerably between individuals based on factors such as age, genetics, and overall health status.
- During puberty, testicles grow significantly, reaching their adult size typically by age 16-17.
- It's normal for one testicle (usually the left) to hang slightly lower than the other, and for there to be minor size differences between the two testicles.
- Significant deviations from the average size range or sudden changes in testicle size should prompt medical evaluation, as they could indicate conditions such as hydrocele, varicocele, infection, or in rare cases, tumors.
Importance of Regular Self-Examination
Regular self-examination is recommended to become familiar with your normal size and to detect any concerning changes early.
- This practice can help in the early detection of potential issues, allowing for timely medical intervention if necessary.
- The study by 1 provides reference values for testicular volume dependent on age, height, and weight in boys aged 0-18 years, which can be useful in clinical practice for evaluating testicular development and detecting disorders.
Clinical Evaluation of Testicular Size
In clinical practice, the evaluation of testicular size is crucial for assessing the onset, progression, and disorders of puberty, as well as for evaluating fertility in adults.
- The use of ultrasound measurements, as discussed in 2, provides a high degree of accuracy and reproducibility for quantitating testicular volume.
- However, the study by 3 highlights that measurements done with a caliper can overestimate testicular length, thickness, and width compared to ultrasound method, emphasizing the importance of choosing the appropriate measurement technique.